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Old 12-01-2001, 03:50 PM   #1
TurboRex
Scooby Specialist
 
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:
04 STI, 07 FXT

Default Translating the O2 Sensor Readings

I recently purchased an obdii scanner and noticed it is giving me O2 sensor readings. The readings on a test run went from 0.16 - 1.01. Closed loop readings are only good to see that the ecu is adjusting trying to get the proper a/f ratio. At wot, the readings would tell my a/f ratio. However, I don't have a conversion chart. Does anyone know where to find this? Also, if these are readings of the wideband o2 sensor, then would need this conversion chart. I don't know much about o2 sensors but I would think that if I am getting a 1.01v reading then it must be off the wideband sensor. I think the range is 0.00 - 2.0v on the wideband...is that correct?

Thanks for any info,

Greg
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Old 12-03-2001, 05:37 PM   #2
TurboRex
Scooby Specialist
 
Member#: 8635
Join Date: Jul 2001
Location: Texas
Vehicle:
04 STI, 07 FXT

Default

If I understand right (after a little more research), the front o2 sensor gives two signals. One from outside air and the other from the exhaust. Thus, the o2 sensor reading (say on the obdii)you get is the voltage difference between these two signals. Does anyone have any knowledge of this?

I have the data as does anyone with an obdii. I just need to know how to interpret it.

Greg
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